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Sentry is Whatâs Next in ADS-B Portables. Sentry is a compact, powerful, next-generation Dual-Band ADS-B receiver. It provides reassuring redundancy for location tracking, compatible with four GNSS systems: GPS, Galileo, GLONASS, and BeiDu and can track three satellite constellations concurrently. In addition to essential FIS-B weather, flight information, traffic, and attitude, Sentry adds a Carbon Monoxide sensor and alarm, a 12-hour battery, and a high-capacity data card for Weather Replay and storage. Sentry is packaged in the smallest form factor yet for a device this capable.